Mge3Ale1Zn(AZ31)alloy was caliber rolled isothermally in the temperature range of 250e450C to develop fine grains of 3.6e12.5 mm.The stressestrain curves obtained from tensile tests at room temperature were found to ...Mge3Ale1Zn(AZ31)alloy was caliber rolled isothermally in the temperature range of 250e450C to develop fine grains of 3.6e12.5 mm.The stressestrain curves obtained from tensile tests at room temperature were found to vary with the temperature employed in caliber rolling.Maximum tensile strength of 290 MPa and ductility of 13.5%were obtained upon caliber rolling at 300C as compared to 188 MPa and 15.2%,respectively,in the mill-rolled condition.The variations in tensile properties are explained by the concomitant grain size,texture and twins obtained as a function of caliber rolling temperature.展开更多
Calibre rolling of Mg-3Al-1Zn alloy at 300℃ led to development of fine grain size of 3μm.Subsequent annealing,from 5 to 6000 minutes at 300-450℃,revealed faster grain growth initially up to 60 minutes,which became ...Calibre rolling of Mg-3Al-1Zn alloy at 300℃ led to development of fine grain size of 3μm.Subsequent annealing,from 5 to 6000 minutes at 300-450℃,revealed faster grain growth initially up to 60 minutes,which became sluggish on prolonged annealing.The time exponent for grain growth kinetics(n)suggests bi-linear behaviour with n=0.11 and 0.008 over these time scales.The activation energy,based on various n values,varied over wide ranges that made the understanding of the mechanisms for grain growth difficult.This problem is explained by concurrent evolution of texture and grain boundary structure.The effect of grain growth on hardness at ambient temperature was found to follow the H-P type relationship.展开更多
基金We express our thanks to DST for funding under FIST program SR/FST/ETII e 054/2000 for purchase of Universal Testing Machine and high temperature test facility.
文摘Mge3Ale1Zn(AZ31)alloy was caliber rolled isothermally in the temperature range of 250e450C to develop fine grains of 3.6e12.5 mm.The stressestrain curves obtained from tensile tests at room temperature were found to vary with the temperature employed in caliber rolling.Maximum tensile strength of 290 MPa and ductility of 13.5%were obtained upon caliber rolling at 300C as compared to 188 MPa and 15.2%,respectively,in the mill-rolled condition.The variations in tensile properties are explained by the concomitant grain size,texture and twins obtained as a function of caliber rolling temperature.
文摘Calibre rolling of Mg-3Al-1Zn alloy at 300℃ led to development of fine grain size of 3μm.Subsequent annealing,from 5 to 6000 minutes at 300-450℃,revealed faster grain growth initially up to 60 minutes,which became sluggish on prolonged annealing.The time exponent for grain growth kinetics(n)suggests bi-linear behaviour with n=0.11 and 0.008 over these time scales.The activation energy,based on various n values,varied over wide ranges that made the understanding of the mechanisms for grain growth difficult.This problem is explained by concurrent evolution of texture and grain boundary structure.The effect of grain growth on hardness at ambient temperature was found to follow the H-P type relationship.
